/*
 * $Id: ConcatPdf.java 3373 2008-05-12 16:21:24Z xlv $
 *
 * Copyright 2002 by Mark Thompson
 *
 * The contents of this file are subject to the Mozilla Public License Version 1.1
 * (the "License"); you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the License.
 *
 * The Original Code is 'iText, a free JAVA-PDF library'.
 *
 * The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
 * the Initial Developer are Copyright (C) 1999-2006 by Bruno Lowagie.
 * All Rights Reserved.
 * Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
 * are Copyright (C) 2000-2006 by Paulo Soares. All Rights Reserved.
 *
 * Contributor(s): all the names of the contributors are added in the source code
 * where applicable.
 *
 * Alternatively, the contents of this file may be used under the terms of the
 * LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
 * provisions of LGPL are applicable instead of those above.  If you wish to
 * allow use of your version of this file only under the terms of the LGPL
 * License and not to allow others to use your version of this file under
 * the MPL, indicate your decision by deleting the provisions above and
 * replace them with the notice and other provisions required by the LGPL.
 * If you do not delete the provisions above, a recipient may use your version
 * of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the MPL as stated above or under the terms of the GNU
 * Library General Public License as published by the Free Software Foundation;
 * either version 2 of the License, or any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Library general Public License for more
 * details.
 *
 * If you didn't download this code from the following link, you should check if
 * you aren't using an obsolete version:
 * https://github.com/LibrePDF/OpenPDF
 */

package com.lowagie.tools;

import java.io.FileOutputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import com.lowagie.text.Document;
import com.lowagie.text.pdf.PdfCopy;
import com.lowagie.text.pdf.PdfImportedPage;
import com.lowagie.text.pdf.PdfReader;
import com.lowagie.text.pdf.SimpleBookmark;

/**
 * Tool that can be used to concatenate existing PDF files.
 * @since 2.1.1 (renamed to follow Java naming conventions)
 */
public class ConcatPdf {
    
    /**
     * This class can be used to concatenate existing PDF files.
     * (This was an example known as PdfCopy.java)
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        if (args.length < 2) {
            System.err.println("arguments: file1 [file2 ...] destfile");
        }
        else {
            try {
                int pageOffset = 0;
                List<Map<String, Object>> master = new ArrayList<>();
                int f = 0;
                String outFile = args[args.length-1];
                Document document = null;
                PdfCopy  writer = null;
                while (f < args.length-1) {
                    // we create a reader for a certain document
                    PdfReader reader = new PdfReader(args[f]);
                    reader.consolidateNamedDestinations();
                    // we retrieve the total number of pages
                    int n = reader.getNumberOfPages();
                    List<Map<String, Object>> bookmarks = SimpleBookmark.getBookmarkList(reader);
                    if (bookmarks != null) {
                        if (pageOffset != 0)
                            SimpleBookmark.shiftPageNumbersInRange(bookmarks, pageOffset, null);
                        master.addAll(bookmarks);
                    }
                    pageOffset += n;
                    System.out.println("There are " + n + " pages in " + args[f]);
                    
                    if (f == 0) {
                        // step 1: creation of a document-object
                        document = new Document(reader.getPageSizeWithRotation(1));
                        // step 2: we create a writer that listens to the document
                        writer = new PdfCopy(document, new FileOutputStream(outFile));
                        // step 3: we open the document
                        document.open();
                    }
                    // step 4: we add content
                    PdfImportedPage page;
                    for (int i = 0; i < n; ) {
                        ++i;
                        page = writer.getImportedPage(reader, i);
                        writer.addPage(page);
                        System.out.println("Processed page " + i);
                    }
                    writer.freeReader(reader);
                    f++;
                }
                if (!master.isEmpty())
                    writer.setOutlines(master);
                // step 5: we close the document
                document.close();
            }
            catch(Exception e) {
                e.printStackTrace();
            }
        }
    }
}
